Many people start dragging out their holiday decorations after Thanksgiving, a tradition that might trigger allergies.
Researchers tested a live Christmas tree, and found the mold count was 5 times higher than normal two weeks after setting up the tree inside a house.
Scientists say people with mold allergies may consider putting an air purifier in the same room as the tree, or just setting it up later in the season.
Experts say an artificial tree might not be much better, since it's usually stored in dusty and mildewy attics or basements.
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